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Balanus trigonus: oral cone, posterior view; and oral cone, lefft lateral view.

From: Anderson, D. T. 1980. Barnacles - structure, function, development and evolution. Chapman and Hall London..

This image is referenced by the following definitions:

Labrum  [Anderson, 1980]
Mandible  [Anderson, 1980]
Mandibular palp  [Anderson, 1980]
Maxilla  [Anderson, 1980]
Maxillule  [Anderson, 1980]
Oral cone  [Anderson, 1980]